The leak tightness of concrete water tanks, digesters and silos is a criterion of prime importance that requires the expertise of a design, construction and maintenance specialist. VSL offers a diverse range of solutions meeting this requirement, and which can be combined to create bespoke packages or applied as standalone services for water tank construction projects.

Ground improvement

The improvement of ground properties guarantees solid foundations and therefore, improved stability, durability, and increased success of construction works. Ground improvement also reduces the cost of foundation works.

Ground improvement methods include:

• Soil consolidation techniques such as grouting, jet grouting, vibro-compaction, stone columns, soil mixing
• Environmental protection such as slurry walls and curtain grout
• Temporary consolidation such as curtain wall by ground freezing
• Dewatering
• Drainage and preloading to consolidate compressive soils

Deep foundations for water tank construction

By transferring loads deep into the ground to competent soils or rock, these structural elements improve the stability and durability of water tanks, digesters and silos.

Cut-off walls

Acting as a containing structure, these concrete walls built beneath the surface help preventing from any water movement in the ground to improve ground stability. They also prevent from any ground contamination by containing liquid pollutants.

Horizontal directional drilling

This trenchless technology used to pass cables (energy, utilities, etc.) underwater or to bypass infrastructure without disrupting the surface or surrounding soil.

 “A unique solution which is easier to achieve and less inconvenient for users of surrounding infrastructure.”


An invention of VSL Technologies, VSoL® retaining wall system combines a range of flexible and cost-effective solutions, which can support very heavy loads at any stage of construction to provide excavation support and temporary or permanent walls. VSoL® is exceptionally quick to install, leading to significant savings in time and costs over conventional wall systems.

Post-tensioning for slab on grade

This cost-effective solution, highly suitable for water tanks, allows a reduction in the number of joints and enhances the watertightness of slabs. Our system offers additional strength and flexibility, increased robustness, abrasion resistance, design flexibility and lower maintenance costs.

Post-tensioning for water tank construction

An active structural reinforcement method used to ensure the leak-tightness of retaining structures, such as water tanks, digesters and silos. Post tensioning allows for an optimised design of these structures by offering design flexibility and an overall improvement of durability. It can also offers significant savings through a reduction of required construction materials and shorter construction time.

Tank construction

Construction of concrete leak tight containment structures, such as water tanks, digesters and silos. This includes the detailing and incorporation of post-tensioning systems to strengthen the structure throughout all stages of construction and ensures stability and durability.

Heavy lifting

A range of techniques to handle heavy loads, including lifting, lowering, tilting and sliding, that allow for alternative construction methods compared with standard in-situ or crane. These bespoke techniques are designed to meet each project’s requirements and offer an increased opportunity for creativity, scale and speed of construction.


A monitoring scheme, including the integration of permanent or quasi-permanent sensor systems, which allows the collection and analysis of data to control and anticipate the structural behaviour and stability of a water tank, digester or silo, and optimise maintenance and repair interventions.

As soon as your water tank, digester or silo is built, it is entering a long-term life cycle with evolving needs and continuous preservation, repairs and upgrading obligations.

Discover how to preserve your asset